Automatic cross-slide feed-trip for lathes.



. W. L. MILLER.

AUTOMATIC GROSS SLIDE FEED TRIP FOR LATHES.

APPLICATION FILED MAR. 28, 1913.

1,072,484. Patented Sept. 9, 1913.

2 BHEETSSHEET 1.

D% l I W. L. MILLER.

AUTOMATIC moss SLIDE. FEED TRIP FOR LATHES.

APPLICATION FILED MAR. 28, 1913 Patented Sept. 9, 1913.

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UNITED PATENT @FFTCE.

WILLIAM L. MILLER, OF MADISON, WISCONSIN, ASSIGNOR TO GISHOLT MACHINE COMPANY, OF MADISON, WISCONSIN, A CORPORATION OF WISCONSIN.

AUTOMATIC CROSS-SLIDE FEED-TRIP FOR LATHES.

Application filed March 28,

To all whom it may concern Be it known that I, TVILLIAM L. Minion, a citizen of the United States, residing at Madison, :in the county of Dane and State of \Visconsin, have invented certain new and useful Improvements in Automatic UrossSlide F ecd-Trips for Lathes, of which the following is a specification.

This invention relates to improvements in lathes, and has reference more particularly to a new and improved mechanism for antomatically arresting the feed movement of the cross-slide.

The main object of the invention is to provide a mechanism that will permit a liner adjustment of the automatic feed-trip mechanism than has heretofore been possible, and by which successive teed-arresting move ments can be effected in very close succession corresponding to very short movements of the cross-slide tool.

lVith this object in view, my invention comprehends, as its chief essential feature, the provision of a teed-trip disk that is geared to rotate in a fixed ratio to the cross- :t'eed screw, and carrying on its periphery one or more trip-blocks cooperating with a lever through which the driving mechanism of the cross-l eed screw may be disconnected; the rate of movei'nent of the periphery of said teed-trip disk hearing such a relation to the rate of movement of the cross-slide as to enable successive tripping movements to occur under successive movements of the cross-slide of much shorter extent than is possible where the feed-trip mechanism is attached directly to the cross-slide itself.

The subject matter of my present invention, its mode of operation, and the advantages which inhere therein may be readily understood when considered in connection with the accompanying drawings, in which I have illustrated my invention as applied to an ordinary engine lathe; and referring theret0,

Figure 1 is a side elevation of the headstock end of a lathe, showing a cross-slide carriage and cross-slide, with my improved cross-slide trip applied thereto. Fig. 2 is an enlarged vertical section on line 2--2 of Fig. 1. Fig. 3 is an enlarged vertical section on the line 33 of Fig. 1. Fig. 4L is a detail of one of the tripping dogs. Fig. 5 is a fragmentary top plan detail view, partly in horizontal section on line 5-5 of Specification of Letters Patent.

Patented Sept. 9, 1.913.

1913. Seria1N0.757,386.

Fig. 1., of a catch mechanism between the trip-arm and clutch-lever. Fig. 6 is a top plan view of the cross-slide reversing gear.

Referring to the drawings, 10 may designate as an entirety a portion oi. the lathe bed, in bearings 11 and 12 of which is mounted the usual spindle 13 having stepped pulley l t, chuck-head l5, and chuck-jaws 16. On ways 17 of the lathe bed is mounted the usual cross-slide carriage 18 which, in turn, supports the crossslide 19; this latter in turn carrying the usual toolearrier 20 and tool-clamp or holder 21, all as usual in lathes o1. this type.

The cross-slide 19 is rcciprocatial transversely ol' the ways 17 by the usual screw 22 suitably journaled in. the cross-slide carriage 1S and engaging a nut 23 confined between depending lugs of the cross-slide through which the screw passes, as usual. The screw is driven in either direction from the lathe spimlle 1.3 through a train oi gears comprising gear 2 t on the spindle, intermediate gear gear 26 on a cross-shaft 27, a change-guin- 28 on the remote end of the latter meshing with and driving a change-gear 29 fast on another cross-shatt 30, a bevelgear ill on the other end of shaft 230, cooperating bevel-gears 252 and 32 loose on a cotmteeshalt 253, a double clutch 323 splined on shalt 3?) between biwehgears 32 and 32, gear il-l: loosely mounted on the other end ol shaft 33 and made last with the latter through a clutch 35 splined to sha'l't 39 spurgear 36 loose on a way-shalt $37 and connected to the latter through a manuallycontrolled clutch 38 having an operating handle 3%), bevel-gear 40 on the other end ot shaft 237, cooperating bevel-giair -l-l on a stub-shalt l2, gear 42) on the outer end ol' shaft 42, and cooperating pinion l-zl on the adjacent end of the screw-shalt 22.

Fast on the shaft 537 is a worm 45, that engages and drives a worm-wheel "ill (l ig. on the inner end of a sleeve 4-7 loosely mounted on a bonnet 48 attached to the side wall of the bed 10; and on the other end of the sleeve l? is a disk 18, the circum'terence of which is formed with a dove-tail. groove, as shown, thereby forming a pair of rims 4-5] and 50 to which are secured trip-blocks 5i and 52, respectively, each of said tri 'i-bloeks having a tapered or pointed outer end. The ratio o'l. earing between the worm-drive ot the disk 18 and the cross-feed screw 22 is preferably such that the disk 48 makes one complete revolution on its axis during one complete in or out travel of the cross-slide, and the circumference of the disk is greater in point of length than the extent of in or out travel of the cross-slide, thus making it possible to trip the cross-slide at shorter intervals than the width of the trip-blocks 51 and 52. For instance, if the circumference of the disk is equal to twice the length of travel of the cross-slide, then the crossslide can be tripped in one-half the width of one of the trip-blocks. The trip-blocks on one rim or flange of the disk are used for tripping the cross-slide when it is traveling in toward the center of the lathe spindle; while the trip-blocks on the other rim or liange of the disk are used for tripping the cross-slide when it is traveling out or away from the center of the spindle.

ecured to the side wall of the lathe bed above and transversely of the shaft 37 is a stud 53, on the outer end of which is pivoted a tripar1n 54. The free end of the arm 54 directly overlies the periphery of the disk 48 and has pivoted therein a pair of dogs 55 and 56, one of which is shown in detail in Fig. 4. These dogs have inclined or tapered lower ends, as shown, and are normally maintained in vertical position by springs 57, and, further, are provided each with one square upper corner 58 and a rounded upper corner 59 so that they will yield when engaged by the trip-blocks 51 and 52 in one direction, but are rigid and effect the raising of the arm 54 when engaged by the trip blocks 51 and 52 in the opposite direction; it being understood that the two dogs 55 and 56 are so mounted as to yield in opposite directions relatively to each other. The arm 54 is normally drawn downwardly by a spring 60 to a position in which the dogs 55 and 56 lie in the paths of movement of their coiiperating trip-blocks 51 and 52, respectively.

Pivoted at 61 is a clutch-lever, the lower forked end 62 of which engages the clutch 35, while its upper arm 63 extends upwardly and is slightly offset so as to cross the triparm 54 behind the latter, as clearly shown in Fig. 2. On the inner side of the triparm 54 is a laterally projecting catch 64 that normally engages a notch formed centrally of the upper edge of a keeper 65 formed on the adjacent side of the lever-arm 63; the keeper 65 being of such width that the catch 64, when disengaged from the notch, will still ride upon the upper edge of the keeper 65. A spring 66 connected to the lower arm 62 of the lever normally urges the lever in a direction to separate the clutch member 35 from the clutch-hub of the transmission gear 84. A lever 67 (Fig. 1) afiords manual operation of the direction-reversing clutch 33.

In the operation of the mechanism, assuming that the parts are in the relative positions, shown in Fig. 1, with both of the clutches 85 and 38 engaged, the trip-disk 48 is turning in the direction indicated by the arrow at a peripheral speed greater than the speed of travel of the crossslide. Trip-blocks 52 are secured to the periphery of the disk at such points as it may be desired to interrupt the inward feed of the cross-slide; while trip-blocks 51 may be likewise secured to the periphery of the disk 48 at such points as it may be desired to interrupt the outward feed or travel of the cross-slide. Then one of the trip-blocks 52 engages the dog 56, the trip-arm 54 is raised, disengaging the catch 64 from the notch of the keeper 65, whereupon the spring (36 at once acts to retract the clutchmember 35, thereby arresting the further inward travel of the cross-slide until the parts are restored to normal position by manual manipulation of the lever-arm 63, whereupon the feeding movement is resumed. If, during this action, one or more of the trip-blocks 51. engages the dog 55, the latter is merely tripped idly without affecting the trip-arm 54. The same operation takes place when the cross-slide is traveling in the reverse direction and the tripping disk 48 is, consequently, turning in the opposite direction. In such case the tripblocks 51 and dogs are the operative members to raise the trip-arm 54 and interrupt the feed, while the trip-blocks 52 and dogs 56 merely engage each other idly.

My invention by employing a disk geared to turn in a fixed ratio to the turning move ment of the cross-slide screw, with tripblocks applied to the circumference thereof, enables the operator to secure a much finer adjustment of the cross-slide tripping action than has heretofore been possible; and it will be obvious that the greater the diameter of the disk 48 (under a fixed ratio of the worm-drive relatively to the cross-slide travel), the finer will be the feed-tripping action obtainable.

1. In a cross-slide tripping mechanism for lathes, the combination of a cross-slide, mechanism, including a clutch, foractuating said cross-slide, means constantly urging said clutch into disengaged position, a disk geared to turn in a fixed ratio to the movement of said cross-slide, trip-blocks mounted on said disk, and means actuated by said trip-blocks controlling said clutch-disengagmg means.

2. In a cross-slide tripping mechanism for lathes, the combination of a cross-slide, mechanism, including a clutch, for actuating said cross-slide, means constantly urging said clutch intodisengaged position, a disk geared to turn in a fixed ratio to the movement OIE said cross-slide, trip-blocks mounted on said disk, a clutch-shitting lever, a movable member carrying a dog disposed in the path of said trip-blocks, and means actuated by said movable member controlling the movement of said lever in a direction to effect disengagement of said clutch.

3. In a cross-slide tripping mechanism for lathes, the combination of a cross-slide, mechanism, including a clutch, for actuating said cross-slide, means constantly urging said clutch into disengaged position, a disk geared to turn in a fixed ratio to the movement of said cross slide, trip blocks adjustably mountedion the periphery of said disk, a clutch-shifting lover, a movable member carrying a dog disposed in the path of said trip-blocks, said dog being mounted to yield laterally in one direction only, and means actuated by said movable member controlling the n'iovement of said clutchshitting lever in a direction to effect disengagei'nent of said clutch.

4-. In a cross-slide tripping mechanism for lathes, the combination of a cross-slide, mechanisn'i, including a clutch, for actuating said cross-slide, means constantly urging said clutch into disengaged position, a disk geared to turn in a fixed ratio to the movement of said cross-slide, trip-blocks adjustably mounted on the periphery of said disk, a clutch-shifting lover, a pivoted trip-arm, a dog pivoted in the free end of said triparm and normally in the path of said tripblocks, said dog yielding laterally under contact of said trip-blocks when moving in one direction but rigid under such contact when said trip-blocks are moving in the opposite direction, and means actuated by said trip-arm controlling the movement of said clutch-shifting lever in a direction to effect diseiigagement of said clutch.

In a cross-slide tripping mechanism for lathes, the combination of a cross-slide, mechanism, including a clutch, for actuating said cross-slide in both its in and out movements, means constantly urging said clutch into disengaged position, a disk geared to said cross-slide actuating mechanism to turn in a fixed ratio to the movement of said crossslide, two sets of trip-blocks mounted on said disk, and means actuated by the trip-blocks of each oil? said sets controlling said clatoll-disengaging means.

(5. .In a cross-slide tripping mechanism for lathes, the combination of a cross-slide, mechanism, including a clutch, :lior actuating said cross-slide, means constantly urging said clutch into disengaged position, a disk geared to said cross-slide actuating mechanism, to turn in a fixed ratio to the movement oi. said cross-slide, two sets of trip-bloeks mounted on said disk, a clutchshilting lever, a movable member carrying a pair of dogs disposed respectively in the paths of said sets 0f trip-blocks, one of said dogs being in operative relation to its cooperating set of trip-blocks under a turning movement of said disk in one direction and the other of said dogs being in operative relation to its cooperating set of trip blocks under a turning movement of said disk in the opposite direction, and means actuated by said movable member controlling the n'iovement oi. said clutch-shifting lever in a direction to ell'ect disengagement of said clutch.

7. In a cross-slide tripping mechanism for .lathes, the combination of a cross-slide, mechanism, including a clutch, for actuating said cross-slide, a disk geared to turn in a fixed ratio to the movement of said cross-slide, trip-blocks mounted on said disk, a clutch-shifting lever, a spring actuating said lever in one direction, a catch norn'lally holding said lever against the ac tion of said spring, and means actuated by said trip-blocks for releasing said catch.

WVILLIA M L. 1\ IILLER.

Witnesses:

J. E. Ru'rni, R. S. ALL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

